Designing Embedded Communications Software by T. Sridhar

By T. Sridhar

* increase method functionality * Optimize protocol implementation * bring up code maintainability Create community communications software program with a radical realizing of the fundamental system-level layout and implementation offerings and the way they impact the p

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This can be done using a pointer or an endof-frame indication. 4, assume a buffer size of 258 bytes, of which two bytes are used for management or “housekeeping” purposes, and 256 bytes are used for data. The parameters can include a count of the valid bytes in the buffer, whether this is the last buffer in the frame, status of the reception, and so on. Now assume that the frames received are of size 300, 600, 256, 325 and 512 bytes. 4). The “Total Frame Size” column details how the frame sizes are calculated based on the count of valid bytes in the buffers constituting the frame (the last buffer in a frame is the one where the end-of- frame indication is set by the controller).

If the controller requires that buffers be located only in a specific area of memory, the driver copies the frames from the driver area to the specified area in memory. It then flags the controller to indicate that the buffers are again available to receive frames. This is a slightly inflexible method but unavoidable due to the restrictions of the controllers. The alternate case is where the controllers can transfer the received frames to any area of memory. So, when a frame is received, the driver removes the linked list of buffers from the controller, hands it a new set of buffers in a different area of memory, and uses the received buffers to pass the frames to its higher layer.

So, when a frame is received, the driver removes the linked list of buffers from the controller, hands it a new set of buffers in a different area of memory, and uses the received buffers to pass the frames to its higher layer. This is a more efficient way of handling received frames since there is no performance degradation due to copying frames from the controller buffers to the driver buffers. Handling Received Frames The driver passes the received frames to the higher layer. , whether the driver and its higher layer are in the same memory space, a common scenario in embedded systems.